/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2007 Blender Foundation.
 * All rights reserved.
 *
 *
 * Contributor(s): Joseph Eagar, Joshua Leung
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/editors/mesh/editmesh_loopcut.c
 *  \ingroup edmesh
 */

#include "DNA_object_types.h"

#include "MEM_guardedalloc.h"

#include "BLI_stack.h"
#include "BLI_string.h"
#include "BLI_math.h"

#include "BLT_translation.h"

#include "DNA_mesh_types.h"

#include "BKE_context.h"
#include "BKE_modifier.h"
#include "BKE_report.h"
#include "BKE_editmesh.h"
#include "BKE_unit.h"
#include "BKE_layer.h"

#include "GPU_immediate.h"
#include "GPU_matrix.h"
#include "GPU_state.h"

#include "UI_interface.h"

#include "ED_screen.h"
#include "ED_space_api.h"
#include "ED_view3d.h"
#include "ED_mesh.h"
#include "ED_numinput.h"

#include "RNA_access.h"
#include "RNA_define.h"
#include "RNA_enum_types.h"

#include "WM_api.h"
#include "WM_types.h"

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"

#include "mesh_intern.h"  /* own include */

#define SUBD_SMOOTH_MAX 4.0f
#define SUBD_CUTS_MAX 500

/* ringsel operator */

/* struct for properties used while drawing */
typedef struct RingSelOpData {
	ARegion *ar;        /* region that ringsel was activated in */
	void *draw_handle;  /* for drawing preview loop */

	struct EditMesh_PreSelEdgeRing *presel_edgering;

	ViewContext vc;

	Depsgraph *depsgraph;

	Object **objects;
	uint     objects_len;

	/* These values switch objects based on the object under the cursor. */
	uint ob_index;
	Object *ob;
	BMEditMesh *em;
	BMEdge *eed;

	NumInput num;

	bool extend;
	bool do_cut;

	float cuts;         /* cuts as float so smooth mouse pan works in small increments */
	float smoothness;
} RingSelOpData;

/* modal loop selection drawing callback */
static void ringsel_draw(const bContext *UNUSED(C), ARegion *UNUSED(ar), void *arg)
{
	RingSelOpData *lcd = arg;
	EDBM_preselect_edgering_draw(lcd->presel_edgering, lcd->ob->obmat);
}

static void edgering_select(RingSelOpData *lcd)
{
	if (!lcd->eed) {
		return;
	}

	if (!lcd->extend) {
		for (uint ob_index = 0; ob_index < lcd->objects_len; ob_index++) {
			Object *ob_iter = lcd->objects[ob_index];
			BMEditMesh *em = BKE_editmesh_from_object(ob_iter);
			EDBM_flag_disable_all(em, BM_ELEM_SELECT);
			DEG_id_tag_update(ob_iter->data, ID_RECALC_SELECT);
			WM_main_add_notifier(NC_GEOM | ND_SELECT, ob_iter->data);
		}
	}

	BMEditMesh *em = lcd->em;
	BMEdge *eed_start = lcd->eed;
	BMWalker walker;
	BMEdge *eed;
	BMW_init(&walker, em->bm, BMW_EDGERING,
	         BMW_MASK_NOP, BMW_MASK_NOP, BMW_MASK_NOP,
	         BMW_FLAG_TEST_HIDDEN,
	         BMW_NIL_LAY);

	for (eed = BMW_begin(&walker, eed_start); eed; eed = BMW_step(&walker)) {
		BM_edge_select_set(em->bm, eed, true);
	}
	BMW_end(&walker);
}

static void ringsel_find_edge(RingSelOpData *lcd, const int previewlines)
{
	if (lcd->eed) {
		const float (*coords)[3] = NULL;
		{
			Mesh *me_eval = (Mesh *)DEG_get_evaluated_id(lcd->depsgraph, lcd->ob->data);
			if (me_eval->runtime.edit_data) {
				coords = me_eval->runtime.edit_data->vertexCos;
			}
		}
		EDBM_preselect_edgering_update_from_edge(lcd->presel_edgering, lcd->em->bm, lcd->eed, previewlines, coords);
	}
	else {
		EDBM_preselect_edgering_clear(lcd->presel_edgering);
	}
}

static void ringsel_finish(bContext *C, wmOperator *op)
{
	RingSelOpData *lcd = op->customdata;
	const int cuts = RNA_int_get(op->ptr, "number_cuts");
	const float smoothness = RNA_float_get(op->ptr, "smoothness");
	const int smooth_falloff = RNA_enum_get(op->ptr, "falloff");
#ifdef BMW_EDGERING_NGON
	const bool use_only_quads = false;
#else
	const bool use_only_quads = false;
#endif

	if (lcd->eed) {
		BMEditMesh *em = lcd->em;
		BMVert *v_eed_orig[2] = {lcd->eed->v1, lcd->eed->v2};

		edgering_select(lcd);

		if (lcd->do_cut) {
			const bool is_macro = (op->opm != NULL);
			/* a single edge (rare, but better support) */
			const bool is_single = (BM_edge_is_wire(lcd->eed));
			const int seltype = is_single ? SUBDIV_SELECT_INNER : SUBDIV_SELECT_LOOPCUT;

			/* Enable gridfill, so that intersecting loopcut works as one would expect.
			 * Note though that it will break edgeslide in this specific case.
			 * See [#31939]. */
			BM_mesh_esubdivide(em->bm, BM_ELEM_SELECT,
			                   smoothness, smooth_falloff, true,
			                   0.0f, 0.0f,
			                   cuts, seltype, SUBD_CORNER_PATH, 0, true,
			                   use_only_quads, 0);

			/* when used in a macro the tessfaces will be recalculated anyway,
			 * this is needed here because modifiers depend on updated tessellation, see T45920 */
			EDBM_update_generic(em, true, true);

			if (is_single) {
				/* de-select endpoints */
				BM_vert_select_set(em->bm, v_eed_orig[0], false);
				BM_vert_select_set(em->bm, v_eed_orig[1], false);

				EDBM_selectmode_flush_ex(lcd->em, SCE_SELECT_VERTEX);
			}
			/* we cant slide multiple edges in vertex select mode */
			else if (is_macro && (cuts > 1) && (em->selectmode & SCE_SELECT_VERTEX)) {
				EDBM_selectmode_disable(lcd->vc.scene, em, SCE_SELECT_VERTEX, SCE_SELECT_EDGE);
			}
			/* force edge slide to edge select mode in in face select mode */
			else if (EDBM_selectmode_disable(lcd->vc.scene, em, SCE_SELECT_FACE, SCE_SELECT_EDGE)) {
				/* pass, the change will flush selection */
			}
			else {
				/* else flush explicitly */
				EDBM_selectmode_flush(lcd->em);
			}
		}
		else {
			/* XXX Is this piece of code ever used now? Simple loop select is now
			 *     in editmesh_select.c (around line 1000)... */
			/* sets as active, useful for other tools */
			if (em->selectmode & SCE_SELECT_VERTEX)
				BM_select_history_store(em->bm, lcd->eed->v1);  /* low priority TODO, get vertrex close to mouse */
			if (em->selectmode & SCE_SELECT_EDGE)
				BM_select_history_store(em->bm, lcd->eed);

			EDBM_selectmode_flush(lcd->em);
			DEG_id_tag_update(lcd->ob->data, ID_RECALC_SELECT);
			WM_event_add_notifier(C, NC_GEOM | ND_SELECT, lcd->ob->data);
		}
	}
}

/* called when modal loop selection is done... */
static void ringsel_exit(bContext *UNUSED(C), wmOperator *op)
{
	RingSelOpData *lcd = op->customdata;

	/* deactivate the extra drawing stuff in 3D-View */
	ED_region_draw_cb_exit(lcd->ar->type, lcd->draw_handle);

	EDBM_preselect_edgering_destroy(lcd->presel_edgering);

	MEM_freeN(lcd->objects);

	ED_region_tag_redraw(lcd->ar);

	/* free the custom data */
	MEM_freeN(lcd);
	op->customdata = NULL;
}


/* called when modal loop selection gets set up... */
static int ringsel_init(bContext *C, wmOperator *op, bool do_cut)
{
	RingSelOpData *lcd;
	Scene *scene = CTX_data_scene(C);

	/* alloc new customdata */
	lcd = op->customdata = MEM_callocN(sizeof(RingSelOpData), "ringsel Modal Op Data");

	em_setup_viewcontext(C, &lcd->vc);

	lcd->depsgraph = CTX_data_depsgraph(C);

	/* assign the drawing handle for drawing preview line... */
	lcd->ar = CTX_wm_region(C);
	lcd->draw_handle = ED_region_draw_cb_activate(lcd->ar->type, ringsel_draw, lcd, REGION_DRAW_POST_VIEW);
	lcd->presel_edgering = EDBM_preselect_edgering_create();
	/* Initialize once the cursor is over a mesh. */
	lcd->ob = NULL;
	lcd->em = NULL;
	lcd->extend = do_cut ? false : RNA_boolean_get(op->ptr, "extend");
	lcd->do_cut = do_cut;
	lcd->cuts = RNA_int_get(op->ptr, "number_cuts");
	lcd->smoothness = RNA_float_get(op->ptr, "smoothness");

	initNumInput(&lcd->num);
	lcd->num.idx_max = 1;
	lcd->num.val_flag[0] |= NUM_NO_NEGATIVE | NUM_NO_FRACTION;
	/* No specific flags for smoothness. */
	lcd->num.unit_sys = scene->unit.system;
	lcd->num.unit_type[0] = B_UNIT_NONE;
	lcd->num.unit_type[1] = B_UNIT_NONE;

	ED_region_tag_redraw(lcd->ar);

	return 1;
}

static void ringcut_cancel(bContext *C, wmOperator *op)
{
	/* this is just a wrapper around exit() */
	ringsel_exit(C, op);
}

static void loopcut_update_edge(RingSelOpData *lcd, uint ob_index, BMEdge *e, const int previewlines)
{
	if (e != lcd->eed) {
		lcd->eed = e;
		lcd->ob = lcd->vc.obedit;
		lcd->ob_index = ob_index;
		lcd->em = lcd->vc.em;
		ringsel_find_edge(lcd, previewlines);
	}
	else if (e == NULL) {
		lcd->ob = NULL;
		lcd->em = NULL;
		lcd->ob_index = UINT_MAX;
	}
}

static void loopcut_mouse_move(RingSelOpData *lcd, const int previewlines)
{
	struct {
		Object *ob;
		BMEdge *eed;
		float dist;
		int ob_index;
	} best = {
		.dist = ED_view3d_select_dist_px(),
	};

	for (uint ob_index = 0; ob_index < lcd->objects_len; ob_index++) {
		Object *ob_iter = lcd->objects[ob_index];
		ED_view3d_viewcontext_init_object(&lcd->vc, ob_iter);
		BMEdge *eed_test = EDBM_edge_find_nearest_ex(&lcd->vc, &best.dist, NULL, false, false, NULL);
		if (eed_test) {
			best.ob = ob_iter;
			best.eed = eed_test;
			best.ob_index = ob_index;
		}
	}

	if (best.eed) {
		ED_view3d_viewcontext_init_object(&lcd->vc, best.ob);
	}

	loopcut_update_edge(lcd, best.ob_index, best.eed, previewlines);
}

/* called by both init() and exec() */
static int loopcut_init(bContext *C, wmOperator *op, const wmEvent *event)
{
	const bool is_interactive = (event != NULL);

	/* Use for redo - intentionally wrap int to uint. */
	const struct {
		uint ob_index;
		uint e_index;
	} exec_data = {
		.ob_index = (uint)RNA_int_get(op->ptr, "object_index"),
		.e_index = (uint)RNA_int_get(op->ptr, "edge_index"),
	};

	ViewLayer *view_layer = CTX_data_view_layer(C);

	uint objects_len;
	Object **objects = BKE_view_layer_array_from_objects_in_edit_mode(view_layer, CTX_wm_view3d(C), &objects_len);

	if (is_interactive) {
		for (uint ob_index = 0; ob_index < objects_len; ob_index++) {
			Object *ob_iter = objects[ob_index];
			if (modifiers_isDeformedByLattice(ob_iter) || modifiers_isDeformedByArmature(ob_iter)) {
				BKE_report(op->reports, RPT_WARNING, "Loop cut does not work well on deformed edit mesh display");
				break;
			}
		}
	}

	view3d_operator_needs_opengl(C);

	/* for re-execution, check edge index is in range before we setup ringsel */
	bool ok = true;
	if (is_interactive == false) {
		if (exec_data.ob_index >= objects_len) {
			return OPERATOR_CANCELLED;
			ok = false;
		}
		else {
			Object *ob_iter = objects[exec_data.ob_index];
			BMEditMesh *em = BKE_editmesh_from_object(ob_iter);
			if (exec_data.e_index >= em->bm->totedge) {
				ok = false;
			}
		}
	}

	if (!ok || !ringsel_init(C, op, true)) {
		MEM_freeN(objects);
		return OPERATOR_CANCELLED;
	}

	/* add a modal handler for this operator - handles loop selection */
	if (is_interactive) {
		op->flag |= OP_IS_MODAL_CURSOR_REGION;
		WM_event_add_modal_handler(C, op);
	}

	RingSelOpData *lcd = op->customdata;

	lcd->objects = objects;
	lcd->objects_len = objects_len;

	if (is_interactive) {
		copy_v2_v2_int(lcd->vc.mval, event->mval);
		loopcut_mouse_move(lcd, is_interactive ? 1 : 0);
	}
	else {

		Object *ob_iter = objects[exec_data.ob_index];
		ED_view3d_viewcontext_init_object(&lcd->vc, ob_iter);

		BMEdge *e;
		BM_mesh_elem_table_ensure(lcd->vc.em->bm, BM_EDGE);
		e = BM_edge_at_index(lcd->vc.em->bm, exec_data.e_index);
		loopcut_update_edge(lcd, exec_data.ob_index, e, 0);
	}

#ifdef USE_LOOPSLIDE_HACK
	/* for use in macro so we can restore, HACK */
	{
		Scene *scene = CTX_data_scene(C);
		ToolSettings *settings = scene->toolsettings;
		const bool mesh_select_mode[3] = {
		    (settings->selectmode & SCE_SELECT_VERTEX) != 0,
		    (settings->selectmode & SCE_SELECT_EDGE)   != 0,
		    (settings->selectmode & SCE_SELECT_FACE)   != 0,
		};

		RNA_boolean_set_array(op->ptr, "mesh_select_mode_init", mesh_select_mode);
	}
#endif

	if (is_interactive) {
		ED_workspace_status_text(C, IFACE_("Select a ring to be cut, use mouse-wheel or page-up/down for number of cuts, "
		                               "hold Alt for smooth"));
		return OPERATOR_RUNNING_MODAL;
	}
	else {
		ringsel_finish(C, op);
		ringsel_exit(C, op);
		return OPERATOR_FINISHED;
	}
}

static int ringcut_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	/* When accessed as a tool, get the active edge from the preselection gizmo. */
	{
		ARegion *ar = CTX_wm_region(C);
		wmGizmoMap *gzmap = ar->gizmo_map;
		wmGizmoGroup *gzgroup = gzmap ? WM_gizmomap_group_find(gzmap, "VIEW3D_GGT_mesh_preselect_edgering") : NULL;
		if ((gzgroup != NULL) && gzgroup->gizmos.first) {
			wmGizmo *gz = gzgroup->gizmos.first;
			const int object_index = RNA_int_get(gz->ptr, "object_index");
			const int edge_index = RNA_int_get(gz->ptr, "edge_index");

			if (object_index != -1 && edge_index != -1) {
				RNA_int_set(op->ptr, "object_index", object_index);
				RNA_int_set(op->ptr, "edge_index", edge_index);
				return loopcut_init(C, op, NULL);
			}
			return OPERATOR_CANCELLED;
		}
	}

	return loopcut_init(C, op, event);
}

static int loopcut_exec(bContext *C, wmOperator *op)
{
	return loopcut_init(C, op, NULL);
}

static int loopcut_finish(RingSelOpData *lcd, bContext *C, wmOperator *op)
{
	/* finish */
	ED_region_tag_redraw(lcd->ar);
	ED_workspace_status_text(C, NULL);

	if (lcd->eed) {
		/* set for redo */
		BM_mesh_elem_index_ensure(lcd->em->bm, BM_EDGE);
		RNA_int_set(op->ptr, "object_index", lcd->ob_index);
		RNA_int_set(op->ptr, "edge_index", BM_elem_index_get(lcd->eed));

		/* execute */
		ringsel_finish(C, op);
		ringsel_exit(C, op);
	}
	else {
		ringcut_cancel(C, op);
		return OPERATOR_CANCELLED;
	}

	return OPERATOR_FINISHED;
}

static int loopcut_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	RingSelOpData *lcd = op->customdata;
	float cuts = lcd->cuts;
	float smoothness = lcd->smoothness;
	bool show_cuts = false;
	const bool has_numinput = hasNumInput(&lcd->num);

	em_setup_viewcontext(C, &lcd->vc);
	lcd->ar = lcd->vc.ar;

	view3d_operator_needs_opengl(C);

	/* using the keyboard to input the number of cuts */
	/* Modal numinput active, try to handle numeric inputs first... */
	if (event->val == KM_PRESS && has_numinput && handleNumInput(C, &lcd->num, event)) {
		float values[2] = {cuts, smoothness};
		applyNumInput(&lcd->num, values);
		cuts = values[0];
		smoothness = values[1];
	}
	else {
		bool handled = false;
		switch (event->type) {
			case RETKEY:
			case PADENTER:
			case LEFTMOUSE: /* confirm */ // XXX hardcoded
				if (event->val == KM_PRESS)
					return loopcut_finish(lcd, C, op);

				ED_region_tag_redraw(lcd->ar);
				handled = true;
				break;
			case RIGHTMOUSE: /* abort */ // XXX hardcoded
				ED_region_tag_redraw(lcd->ar);
				ringsel_exit(C, op);
				ED_workspace_status_text(C, NULL);

				return OPERATOR_CANCELLED;
			case ESCKEY:
				if (event->val == KM_RELEASE) {
					/* cancel */
					ED_region_tag_redraw(lcd->ar);
					ED_workspace_status_text(C, NULL);

					ringcut_cancel(C, op);
					return OPERATOR_CANCELLED;
				}

				ED_region_tag_redraw(lcd->ar);
				handled = true;
				break;
			case MOUSEPAN:
				if (event->alt == 0) {
					cuts += 0.02f * (event->y - event->prevy);
					if (cuts < 1 && lcd->cuts >= 1)
						cuts = 1;
				}
				else {
					smoothness += 0.002f * (event->y - event->prevy);
				}
				handled = true;
				break;
			case PADPLUSKEY:
			case PAGEUPKEY:
			case WHEELUPMOUSE:  /* change number of cuts */
				if (event->val == KM_RELEASE)
					break;
				if (event->alt == 0) {
					cuts += 1;
				}
				else {
					smoothness += 0.05f;
				}
				handled = true;
				break;
			case PADMINUS:
			case PAGEDOWNKEY:
			case WHEELDOWNMOUSE:  /* change number of cuts */
				if (event->val == KM_RELEASE)
					break;
				if (event->alt == 0) {
					cuts = max_ff(cuts - 1, 1);
				}
				else {
					smoothness -= 0.05f;
				}
				handled = true;
				break;
			case MOUSEMOVE:  /* mouse moved somewhere to select another loop */

				/* This is normally disabled for all modal operators.
				 * This is an exception since mouse movement doesn't relate to numeric input.
				 *
				 * If numeric input changes we'll need to add this back see: D2973 */
#if 0
				if (!has_numinput)
#endif
				{
					lcd->vc.mval[0] = event->mval[0];
					lcd->vc.mval[1] = event->mval[1];
					loopcut_mouse_move(lcd, (int)lcd->cuts);

					ED_region_tag_redraw(lcd->ar);
					handled = true;
				}
				break;
		}

		/* Modal numinput inactive, try to handle numeric inputs last... */
		if (!handled && event->val == KM_PRESS && handleNumInput(C, &lcd->num, event)) {
			float values[2] = {cuts, smoothness};
			applyNumInput(&lcd->num, values);
			cuts = values[0];
			smoothness = values[1];
		}
	}

	if (cuts != lcd->cuts) {
		/* allow zero so you can backspace and type in a value
		 * otherwise 1 as minimum would make more sense */
		lcd->cuts = clamp_i(cuts, 0, SUBD_CUTS_MAX);
		RNA_int_set(op->ptr, "number_cuts", (int)lcd->cuts);
		ringsel_find_edge(lcd, (int)lcd->cuts);
		show_cuts = true;
		ED_region_tag_redraw(lcd->ar);
	}

	if (smoothness != lcd->smoothness) {
		lcd->smoothness = clamp_f(smoothness, -SUBD_SMOOTH_MAX, SUBD_SMOOTH_MAX);
		RNA_float_set(op->ptr, "smoothness", lcd->smoothness);
		show_cuts = true;
		ED_region_tag_redraw(lcd->ar);
	}

	if (show_cuts) {
		Scene *sce = CTX_data_scene(C);
		char buf[UI_MAX_DRAW_STR];
		char str_rep[NUM_STR_REP_LEN * 2];
		if (hasNumInput(&lcd->num)) {
			outputNumInput(&lcd->num, str_rep, &sce->unit);
		}
		else {
			BLI_snprintf(str_rep, NUM_STR_REP_LEN, "%d", (int)lcd->cuts);
			BLI_snprintf(str_rep + NUM_STR_REP_LEN, NUM_STR_REP_LEN, "%.2f", smoothness);
		}
		BLI_snprintf(buf, sizeof(buf), IFACE_("Number of Cuts: %s, Smooth: %s (Alt)"),
		             str_rep, str_rep + NUM_STR_REP_LEN);
		ED_workspace_status_text(C, buf);
	}

	/* keep going until the user confirms */
	return OPERATOR_RUNNING_MODAL;
}

/* for bmesh this tool is in bmesh_select.c */
#if 0

void MESH_OT_edgering_select(wmOperatorType *ot)
{
	/* description */
	ot->name = "Edge Ring Select";
	ot->idname = "MESH_OT_edgering_select";
	ot->description = "Select an edge ring";

	/* callbacks */
	ot->invoke = ringsel_invoke;
	ot->poll = ED_operator_editmesh_region_view3d;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_boolean(ot->srna, "extend", 0, "Extend", "Extend the selection");
}

#endif

void MESH_OT_loopcut(wmOperatorType *ot)
{
	PropertyRNA *prop;

	/* description */
	ot->name = "Loop Cut";
	ot->idname = "MESH_OT_loopcut";
	ot->description = "Add a new loop between existing loops";

	/* callbacks */
	ot->invoke = ringcut_invoke;
	ot->exec = loopcut_exec;
	ot->modal = loopcut_modal;
	ot->cancel = ringcut_cancel;
	ot->poll = ED_operator_editmesh_region_view3d;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO | OPTYPE_BLOCKING;

	/* properties */
	prop = RNA_def_int(ot->srna, "number_cuts", 1, 1, 1000000, "Number of Cuts", "", 1, 100);
	/* avoid re-using last var because it can cause _very_ high poly meshes and annoy users (or worse crash) */
	RNA_def_property_flag(prop, PROP_SKIP_SAVE);

	prop = RNA_def_float(ot->srna, "smoothness", 0.0f, -1e3f, 1e3f,
	                     "Smoothness", "Smoothness factor", -SUBD_SMOOTH_MAX, SUBD_SMOOTH_MAX);
	RNA_def_property_flag(prop, PROP_SKIP_SAVE);

	WM_operatortype_props_advanced_begin(ot);

	prop = RNA_def_property(ot->srna, "falloff", PROP_ENUM, PROP_NONE);
	RNA_def_property_enum_items(prop, rna_enum_proportional_falloff_curve_only_items);
	RNA_def_property_enum_default(prop, PROP_INVSQUARE);
	RNA_def_property_ui_text(prop, "Falloff", "Falloff type the feather");
	RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_CURVE); /* Abusing id_curve :/ */

	/* For redo only. */
	prop = RNA_def_int(ot->srna, "object_index", -1, -1, INT_MAX, "Object Index", "", 0, INT_MAX);
	RNA_def_property_flag(prop, PROP_HIDDEN);
	prop = RNA_def_int(ot->srna, "edge_index", -1, -1, INT_MAX, "Edge Index", "", 0, INT_MAX);
	RNA_def_property_flag(prop, PROP_HIDDEN);

#ifdef USE_LOOPSLIDE_HACK
	prop = RNA_def_boolean_array(ot->srna, "mesh_select_mode_init", 3, NULL, "", "");
	RNA_def_property_flag(prop, PROP_HIDDEN);
#endif
}
